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[u/mrichter/AliRoot.git] / MUON / AliMUONTrackLight.cxx
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55fd51b0 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
b88403f3 3 * SigmaEffect_thetadegrees *
55fd51b0 4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpeateose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
16/* $Id$ */
17
3d1463c8 18//-----------------------------------------------------------------------------
55fd51b0 19// Compact information for the muon generated tracks in the MUON arm
20// useful at the last stage of the analysis chain
21// provides a link between the reconstructed track and the generated particle
22// stores kinematical information at gen. and rec. level and
23// the decay history of the muon, allowing the identification of the
24// mother process
25//
26// To be used together with AliMUONPairLight
3d1463c8 27//
28// This class was prepared by INFN Cagliari, July 2006
29// (authors: H.Woehri, A.de Falco)
30//-----------------------------------------------------------------------------
55fd51b0 31
9bdda5f6 32// 13 Nov 2007:
33// Added a temporary fix to FindRefTrack to be able to handle reconstructed tracks
34// generated from ESD muon track information. The problem is that the ESD data at
35// the moment only contains the first hit on chamber 1. Hopefully in the near future
36// this will be fixed and all hit information will be available.
37// - Artur Szostak <artursz@iafrica.com>
38
55fd51b0 39#include "AliMUONTrackLight.h"
40#include "AliMUONTrack.h"
41#include "AliMUONConstants.h"
bd5eb041 42#include "AliMUONVTrackStore.h"
933daf4c 43#include "AliMUONTrackParam.h"
55fd51b0 44
45#include "AliESDMuonTrack.h"
55fd51b0 46#include "AliStack.h"
f202486b 47#include "AliLog.h"
55fd51b0 48
49#include "TDatabasePDG.h"
55fd51b0 50#include "TParticle.h"
51#include "TString.h"
52
b785c4bd 53#include <cstdio>
54
55fd51b0 55ClassImp(AliMUONTrackLight)
56
57//===================================================================
58
59AliMUONTrackLight::AliMUONTrackLight()
60 : TObject(),
61 fPrec(),
62 fIsTriggered(kFALSE),
63 fCharge(-999),
b88403f3 64 fChi2(-1),
55fd51b0 65 fCentr(-1),
66 fPgen(),
67 fTrackPythiaLine(-999),
68 fTrackPDGCode(-999),
69 fOscillation(kFALSE),
b88403f3 70 fNParents(0),
71 fWeight(1)
55fd51b0 72{
73 /// default constructor
74 fPgen.SetPxPyPzE(0.,0.,0.,0.);
75 fPrec.SetPxPyPzE(0.,0.,0.,0.);
76 for (Int_t i=0; i<3; i++) fXYZ[i]=-999;
77 for (Int_t npar = 0; npar < fgkNParentsMax; npar++){
78 fParentPDGCode[npar] = -1;
79 fParentPythiaLine[npar] = -1;
80 }
81 for (Int_t i = 0; i < 4; i++){
82 fQuarkPDGCode[i] = -1;
83 fQuarkPythiaLine[i] = -1;
84 }
85}
86
87//============================================
88AliMUONTrackLight::AliMUONTrackLight(const AliMUONTrackLight &muonCopy)
89 : TObject(muonCopy),
90 fPrec(muonCopy.fPrec),
91 fIsTriggered(muonCopy.fIsTriggered),
92 fCharge(muonCopy.fCharge),
b88403f3 93 fChi2(muonCopy.fChi2),
55fd51b0 94 fCentr(muonCopy.fCentr),
95 fPgen(muonCopy.fPgen),
96 fTrackPythiaLine(muonCopy.fTrackPythiaLine),
97 fTrackPDGCode(muonCopy.fTrackPDGCode),
98 fOscillation(muonCopy.fOscillation),
b88403f3 99 fNParents(muonCopy.fNParents),
100 fWeight(muonCopy.fWeight)
55fd51b0 101{
102 /// copy constructor
103 for (Int_t i=0; i<3; i++) fXYZ[i]=muonCopy.fXYZ[i];
104 for (Int_t npar = 0; npar < fgkNParentsMax; npar++){
105 fParentPDGCode[npar] = muonCopy.fParentPDGCode[npar];
106 fParentPythiaLine[npar] = muonCopy.fParentPythiaLine[npar];
107 }
108 for (Int_t i = 0; i < 4; i++){
109 fQuarkPDGCode[i] = muonCopy.fQuarkPDGCode[i];
110 fQuarkPythiaLine[i] = muonCopy.fQuarkPythiaLine[i];
111 }
112}
113
114//============================================
115AliMUONTrackLight::AliMUONTrackLight(AliESDMuonTrack* muonTrack)
116 : TObject(),
117 fPrec(),
118 fIsTriggered(kFALSE),
119 fCharge(-999),
b88403f3 120 fChi2(-1),
55fd51b0 121 fCentr(-1),
122 fPgen(),
123 fTrackPythiaLine(-999),
124 fTrackPDGCode(-999),
125 fOscillation(kFALSE),
b88403f3 126 fNParents(0),
127 fWeight(1)
55fd51b0 128{
129 /// constructor
f202486b 130 fPgen.SetPxPyPzE(0.,0.,0.,0.);
131 for (Int_t npar = 0; npar < fgkNParentsMax; npar++){
132 fParentPDGCode[npar] = -1;
133 fParentPythiaLine[npar] = -1;
134 }
135 for (Int_t i = 0; i < 4; i++){
136 fQuarkPDGCode[i] = -1;
137 fQuarkPythiaLine[i] = -1;
138 }
139 FillFromESD(muonTrack);
55fd51b0 140}
141
142//============================================
b88403f3 143AliMUONTrackLight::~AliMUONTrackLight()
144{
145/// Destructor
146}
147
148//============================================
149
150void AliMUONTrackLight::FillFromAliMUONTrack(AliMUONTrack *trackReco,Double_t zvert){
151 /// this method sets the muon reconstructed momentum according to the value given by AliMUONTrack
f202486b 152 AliMUONTrackParam* trPar = trackReco->GetTrackParamAtVertex();
153 if (!trPar) {
154 AliError("The track must contain the parameters at vertex");
155 return;
61fed964 156 }
f202486b 157 this->SetCharge(Int_t(TMath::Sign(1.,trPar->GetInverseBendingMomentum())));
158 this->SetPxPyPz(trPar->Px(),trPar->Py(), trPar->Pz());
b88403f3 159 this->SetTriggered(trackReco->GetMatchTrigger());
160
f202486b 161 Double_t xyz[3] = { trPar->GetNonBendingCoor(),
162 trPar->GetBendingCoor(),
163 trPar->GetZ()};
61fed964 164 if (zvert!=-9999) xyz[2] = zvert;
b88403f3 165 this->SetVertex(xyz);
166}
167
168//============================================
169void AliMUONTrackLight::FillFromESD(AliESDMuonTrack* muonTrack,Double_t zvert){
55fd51b0 170 /// computes prec and charge from ESD track
171 Double_t mumass = TDatabasePDG::Instance()->GetParticle(13)->Mass();
172 Double_t thetaX = muonTrack->GetThetaX();
173 Double_t thetaY = muonTrack->GetThetaY();
174 Double_t tanthx = TMath::Tan(thetaX);
175 Double_t tanthy = TMath::Tan(thetaY);
176 Double_t pYZ = 1./TMath::Abs(muonTrack->GetInverseBendingMomentum());
177 Double_t pz = - pYZ / TMath::Sqrt(1.0 + tanthy * tanthy);
178 Double_t px = pz * tanthx;
179 Double_t py = pz * tanthy;
180 fCharge = Int_t(TMath::Sign(1.,muonTrack->GetInverseBendingMomentum()));
181 Double_t energy = TMath::Sqrt(mumass * mumass + px*px + py*py + pz*pz);
182 fPrec.SetPxPyPzE(px,py,pz,energy);
b88403f3 183 // get the position
184 fXYZ[0] = muonTrack->GetNonBendingCoor();
185 fXYZ[1] = muonTrack->GetBendingCoor();
186 if (zvert==-9999) fXYZ[2] = muonTrack->GetZ();
187 else fXYZ[2] = zvert;
188 // get the chi2 per d.o.f.
189 fChi2 = muonTrack->GetChi2()/ (2.0 * muonTrack->GetNHit() - 5);
190 fIsTriggered = muonTrack->GetMatchTrigger();
55fd51b0 191}
192
193//============================================
194void AliMUONTrackLight::SetPxPyPz(Double_t px, Double_t py, Double_t pz){
195 /// set the reconstructed 4-momentum, assuming the particle is a muon
196 Double_t mumass = TDatabasePDG::Instance()->GetParticle(13)->Mass();
197 Double_t energy = TMath::Sqrt(mumass * mumass + px*px + py*py + pz*pz);
198 fPrec.SetPxPyPzE(px,py,pz,energy);
199}
200
201//============================================
b88403f3 202void AliMUONTrackLight::FillMuonHistory(AliStack *stack, TParticle *part){
55fd51b0 203 /// scans the muon history to determine parents pdg code and pythia line
204 Int_t countP = -1;
205 Int_t parents[10], parLine[10];
206 Int_t lineM = part->GetFirstMother();//line in the Pythia output of the particle's mother
207
55fd51b0 208 TParticle *mother;
209 Int_t status=-1, pdg=-1;
210 while(lineM >= 0){
b88403f3 211
55fd51b0 212 mother = stack->Particle(lineM); //direct mother of rec. track
213 pdg = mother->GetPdgCode();//store PDG code of first mother
b88403f3 214 // break if a string, gluon, quark or diquark is found
215 if(pdg == 92 || pdg == 21 || TMath::Abs(pdg) < 10 || IsDiquark(pdg)) break;
55fd51b0 216 parents[++countP] = pdg;
217 parLine[countP] = lineM;
218 status = mother->GetStatusCode();//get its status code to check if oscillation occured
219 if(IsB0(parents[countP]) && status == 12) this->SetOscillation(kTRUE);
220 lineM = mother->GetFirstMother();
221 }
222 //store all the fragmented parents in an array:
223 for(int i = 0; i <= countP; i++){
224 this->SetParentPDGCode(i,parents[countP-i]);
225 this->SetParentPythiaLine(i,parLine[countP-i]);
226 }
55fd51b0 227 fNParents = countP+1;
228 countP = -1;
b88403f3 229
55fd51b0 230 //and store the lines of the string and further quarks in another array:
231 while(lineM >= 0){
232 mother = stack->Particle(lineM);
233 pdg = mother->GetPdgCode();
234 //now, get information before the fragmentation
235 this->SetQuarkPythiaLine(++countP, lineM);//store the line of the string in index 0
236 this->SetQuarkPDGCode(countP, pdg);//store the pdg of the quarks in index 1,2
237 lineM = mother->GetFirstMother();
238 }
b88403f3 239
55fd51b0 240 //check if in case of HF production, the string points to the correct end
241 //and correct it in case of need:
242 countP = 1;
b88403f3 243 for(int par = 0; par < 4; par++){
244 if(TMath::Abs(this->GetQuarkPDGCode(par)) < 6){
245 countP = par; //get the quark just before hadronisation
246 break;
247 }
248 }
55fd51b0 249 if(this->GetQuarkPythiaLine(countP) > -1 && (this->GetParentFlavour(0)==4 || this->GetParentFlavour(0)==5)){
250 if(this->GetParentFlavour(0) != TMath::Abs(this->GetQuarkPDGCode(countP))){
251
9bdda5f6 252 AliWarning(Form("quark flavour of parent and that of quark do not correspond: %d %d --> correcting\n",
253 this->GetParentFlavour(0), TMath::Abs(this->GetQuarkPDGCode(countP)))
254 );
255
7cdc832b 256 pdg = this->GetQuarkPDGCode(countP);
257 Int_t line = this->GetQuarkPythiaLine(countP);
55fd51b0 258 this->ResetQuarkInfo();
259 while(TMath::Abs(pdg) != this->GetParentFlavour(0)){//pdg of q,g in Pythia listing following the wrong string end
260 //must coincide with the flavour of the last fragmented mother
261
262 pdg = stack->Particle(++line)->GetPdgCode();
263 }
264 //now, we have the correct string end and the correct line
265 //continue to fill again all parents and corresponding lines
266 while(line >= 0){
267 mother = stack->Particle(line);//get again the mother
268 pdg = mother->GetPdgCode();
269 this->SetQuarkPythiaLine(countP, line);
270 this->SetQuarkPDGCode(countP++, pdg);
271 line = mother->GetFirstMother();
272 }
b88403f3 273 this->PrintInfo("h");
274 }//mismatch
55fd51b0 275 }
276}
b88403f3 277
55fd51b0 278//====================================
279void AliMUONTrackLight::ResetQuarkInfo(){
280 /// resets parton information
281 for(int pos = 1; pos < 4; pos++){//[0] is the string
282 this->SetQuarkPDGCode(pos,-1);
283 this->SetQuarkPythiaLine(pos,-1);
284 }
285}
286
287//====================================
288Bool_t AliMUONTrackLight::IsB0(Int_t intTest) const {
289 /// checks if the particle is a B0
290 Int_t bMes0[2] = {511,531};//flavour code of B0d and B0s
291 Bool_t answer = kFALSE;
292 for(int i = 0; i < 2; i++){
293 if(TMath::Abs(intTest) == bMes0[i]){
294 answer = kTRUE;
295 break;
296 }
297 }
298 return answer;
299}
300//====================================
301Bool_t AliMUONTrackLight::IsMotherAResonance(Int_t index) const {
302 /// checks if mother is a resonance
303 Int_t intTest = GetParentPDGCode(index);
304 // the resonance pdg code is built this way
305 // x00ffn where x=0,1,.. (1S,2S... states), f=quark flavour
306 Int_t id=intTest%100000;
307 return (!((id-id%10)%110));
308}
309//====================================
310Int_t AliMUONTrackLight::GetParentFlavour(Int_t idParent) const {
311 /// returns the flavour of parent idParent (idParent=0 is the oldest
312 /// hadronized parent)
313 Int_t pdg = GetParentPDGCode(idParent);
314 Int_t quark = TMath::Abs(pdg/100);
315 if(quark > 9) quark = quark/10;
316 return quark;
317}
318
319//====================================
57e2ad1a 320void AliMUONTrackLight::PrintInfo(const Option_t* opt){
55fd51b0 321 /// prints information about the track:
322 /// - "H" muon's decay history
323 /// - "K" muon kinematics
324 /// - "A" all variables
325 TString options(opt);
326 options.ToUpper();
327
328 if(options.Contains("H") || options.Contains("A")){ //muon decay history
329 char *name= new char[100];
330 TString pdg = "", line = "";
331 for(int i = 3; i >= 0; i--){
332 if(this->GetQuarkPythiaLine(i)>= 0){
b785c4bd 333 snprintf(name, 100, "%4d --> ", this->GetQuarkPythiaLine(i));
55fd51b0 334 line += name;
b785c4bd 335 snprintf(name, 100, "%4d --> ", this->GetQuarkPDGCode(i));
55fd51b0 336 pdg += name;
337 }
338 }
339 for(int i = 0; i < fNParents; i++){
340 if(this->GetParentPythiaLine(i)>= 0){
b785c4bd 341 snprintf(name, 100, "%7d --> ", this->GetParentPythiaLine(i));
55fd51b0 342 line += name;
b785c4bd 343 snprintf(name, 100, "%7d --> ", this->GetParentPDGCode(i));
55fd51b0 344 pdg += name;
345 }
346 }
b785c4bd 347 snprintf(name, 100, "%4d", this->GetTrackPythiaLine()); line += name;
348 snprintf(name, 100, "%4d", this->GetTrackPDGCode()); pdg += name;
55fd51b0 349
350 printf("\nmuon's decay history:\n");
351 printf(" PDG: %s\n", pdg.Data());
352 printf("line: %s\n", line.Data());
353 }
354 if(options.Contains("K") || options.Contains("A")){ //muon kinematic
355
356 Int_t charge = this->GetCharge();
357 Double_t *vtx = this->GetVertex();
358 TLorentzVector momRec = this->GetPRec();
359 TLorentzVector momGen = this->GetPGen();
360 printf("the track's charge is %d\n", charge);
361 printf("Primary vertex: Vx = %1.3f, Vy = %1.3f, Vz = %1.3f\n", vtx[0], vtx[1], vtx[2]);
362 printf("Generated: Px = %1.3f, Py = %1.3f, Pz = %1.3f\n", momGen.Px(), momGen.Py(), momGen.Pz());
363 printf("Reconstructed: Px = %1.3f, Py = %1.3f, Pz = %1.3f\n", momRec.Px(), momRec.Py(), momRec.Pz());
364 printf("Rec. variables: pT %1.3f, pseudo-rapidity %1.3f, theta %1.3f (%1.3f degree), phi %1.3f (%1.3f degree)\n",
365 momRec.Pt(), momRec.Eta(), momRec.Theta(), 180./TMath::Pi() * momRec.Theta(),
366 momRec.Phi(), 180./TMath::Pi() * momRec.Phi());
367 }
368}
b88403f3 369//====================================
370Bool_t AliMUONTrackLight::IsParentPionOrKaon(Int_t idparent){
371 /// checks if a muon comes from a pion or kaon or a particle that decays into one of these two
372 Int_t pdg = this->GetParentPDGCode(idparent);
373 if (TMath::Abs(pdg)==211 || //pi+
374 TMath::Abs(pdg)==321 || //K+
375 TMath::Abs(pdg)==213 || //rho+
376 TMath::Abs(pdg)==311 || //K0
377 TMath::Abs(pdg)==313 || //K*0
378 TMath::Abs(pdg)==323 //K*+
379 ) {
380 return kTRUE;
381 }
382 else return kFALSE;
383}
384//====================================
9ee1d6ff 385Bool_t AliMUONTrackLight::IsDiquark(Int_t pdg) const{
b88403f3 386 /// check if the provided pdg code corresponds to a diquark
387 pdg = TMath::Abs(pdg);
388 if((pdg > 1000) && (pdg%100 < 10)) return kTRUE;
389 else return kFALSE;
390}